titleSpacing property
The spacing around title
content on the horizontal axis. This spacing is
applied even if there is no leading
content or actions
. If you want
title
to take all the space available, set this value to 0.0.
If this property is null, then AppBarTheme.titleSpacing of ThemeData.appBarTheme is used. If that is also null, then the default value is NavigationToolbar.kMiddleSpacing.
Implementation
final double? titleSpacing;